Výsledky vyhledávání - "Goldberg, D. M."

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Shape Profiles and Orientation Bias for Weak and Strong Lensing Cluster Halos

Publikováno v: The Astrophysical Journal, 2014, 795, 153

We study the intrinsic shape and alignment of isodensities of galaxy cluster halos extracted from the MultiDark MDR1 cosmological simulation. We find that the simulated halos, are extremely prolate on small scales, and increasingly spherical on large

Externí odkaz: http://arxiv.org/abs/1405.2035

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Weak Gravitational Flexion

Autor: Bacon, D. J., Goldberg, D. M., Rowe, B. T. P., Taylor, A. N.

Publikováno v: Mon.Not.Roy.Astron.Soc. 365 (2006) 414-428

Flexion is the significant third-order weak gravitational lensing effect responsible for the weakly skewed and arc-like appearance of lensed galaxies. Here we demonstrate how flexion measurements can be used to measure galaxy halo density profiles an

Externí odkaz: http://arxiv.org/abs/astro-ph/0504478

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The Galaxy Octopole Moment as a Probe of Weak Lensing Shear Fields

Autor: Goldberg, D. M., Natarajan, P.

Publikováno v: Astrophys.J.564:65,2002

In this paper, we introduce the octopole moment of the light distribution in galaxies as a probe of the weak lensing shear field. While traditional ellipticity estimates of the local shear derived from the quadrupole moment are limited by the width o

Externí odkaz: http://arxiv.org/abs/astro-ph/0107187

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Using Perturbative Least Action to Run N Body Simulations Back in Time

Autor: Goldberg, D. M., Spergel, D. N.

In this report, we present a new method for reconstructing N body initial conditions from a proscribed final density field. This method, Perturbative Least Action (PLA) is similar to traditional least action approaches, except that orbits of particle

Externí odkaz: http://arxiv.org/abs/astro-ph/9909057

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